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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a1d76b8cc63b92cce2ff7ca92322183ec95666dccbe4559925cf6e9bfac3397' 
  AND token = '68TSqMadWNDnZH7DH4ZLjhjJQUrPdNJWJSLOL7Cjm/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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