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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3af88bcdd901c3ead04f8ccbb01b1bdca27960f6c154a1f706844054ed9b3ab7' 
  AND token = '4/eFGrQm7nJLpEkqAZK1DeB0Igy7QVPdHmxEnRy8H4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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