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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96bff094e3f9d5093ad55cb29cf43e58f142eb92cd9c20cbd2f4ee9eb8324143' 
  AND token = 'Flpc0lwKto9iJDVOZvN5+IRfSqyse5AaL9Bp+u2vNt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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