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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc4389008fbc83ff2c1f15dfa8f68af0e8364ba6b9839f7e755421b7aba04f80' 
  AND token = 'nlvmdm/3EAYeFkXHgs806maJW1t1EqhQw2mFBPWPmh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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