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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1bdb7bfa6e45078621809d2847929dab08f4b0840591cb1fad729f188baa1f4' 
  AND token = 'iiCAi96HtDxY43IkwZX0t2xkFgtgYfWjL5wY304o14Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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