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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71394d73fec934791d2fed50aa6f2c011b4c8ff5408eac005eb4224318faa0a1' 
  AND token = 'vdm5GHcvgCcduDUtoh6kG6UwhWMhdodmU6s0PngFDNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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