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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5886f265819613d39928e753d66f031da2de820cd6320007c8daa0ca75acd9c' 
  AND token = 'wPCpVt+Xvcf+h44s/5DuZpscZk6hrcgdcKepP/rpbTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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