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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b590978d2780238ac7c9ad5368655657367da5f47b17e77f6d1d863e3583015' 
  AND token = 'cfNBbkWlBrRWm27KpzMVEP328M2G2zYBl/uM/RppkKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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