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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c60b4207056e093046b9866255bfa8424a82293c569eb42a026c0ba333397ff' 
  AND token = 'cR2UAwalV7IBeGH2lIkHKvRk/EYYWfFkpQvQBmty1r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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