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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a006e26134dda55e332de98a511ed629769b482bd1a15b89cd879b6e9a5ac79' 
  AND token = 'SHs1t4uCutjC9diSrBEgqcsSRKyIhpya7+cRviG0HBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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