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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f89e14fcdb39dcc1b781b3852bcced8e673ec95a71b65e0b582df37a624103a' 
  AND token = 'bmmu30dj7LG2R+a4lV3HUHc5ZmQ8Dw5qhucMZg9NyQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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