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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02fb6c2b3755691f4dc33c416e70105bcb6a7d2c2886d5a388a870921335dc58' 
  AND token = 'vkk4gkdXX6wJE3zREds7kViFzmn318AffEGb/UOUKPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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