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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b300f9b82f3d44a22701db10ce0e7184408aa38819bb1ee46fd2682656910280' 
  AND token = '+nIxGsfG6xge0X9TX94S7Bo2kel+mzEeWc5nm/uU39s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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