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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e6ab7224835df6166d92d2a00b0bfa1ccf26d10993b7d627a6defe9c7f7a6ad' 
  AND token = 'y+eKTW/Clpl0TsyFwPWmCXe4w50tqBotugSeRRDcDko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}