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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bdcd41a49a5e6c77d8f112c2b2021b16ee2f35d0fac4d7eafbdeb7635cab45e' 
  AND token = '40bXb9pc+ODYKzV6VOdmAoI6C0sgdQ2xaA8wwK+bIAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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