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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb431afdc39d7cc2f8225362edfd9299160fc04511a0d48da305c327b91d4462' 
  AND token = 'IRr2qwp19oPq2l9Inn5/2sXFUFQWy+FXNMtIXADON5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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