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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94d84f6577c22e63128d03ca64577dbacbda3dd1936262b3cac9101ce54197fc' 
  AND token = 'rfEkxq9sDYt1Op4AaB3kE1ha7MufKnNddwKJhrnJK/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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