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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3e7221ee43d3de136abe7e6002e79029b2e4af92eacb7922edc460a5838909a' 
  AND token = 'zdcHKTmslASFoPyhdmpVghDVIE1XG4gwUnGg6UFqjtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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