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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fb8b67236f21fabb1a1a59fdd58eb599371105b08ce1ca2fc4a2a9b7e31bbf7' 
  AND token = '5c9i6LCAjqR9Bp8ThIafy0qpGJ71lVly8uIBOUm0A+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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