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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb86fce2e16babb5dbd1af25e393629ccac01564c50bf5510933827a566842fc' 
  AND token = 'AgvQ4YPHbf3WcoMivPyDoGC/Fcscxfd8Dp1LdPJ6Uc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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