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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f814a2e8f2dea0fbf7fc13ee67bdb1a238fb9b3b8f1708ce5b9151758511c2a0' 
  AND token = 'oSKSyOqFWxhQypD60moRPBNuGG4RJAZgMogx60gm67E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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