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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f21937d64f2824d44373e8670a8b2ea5e7e8eed7ac78061b0ab1e9639f05df49' 
  AND token = 'Ua0ba5D4DQRJnLS55YGLfxi5AVNAaZWBlY3sZ+ScEt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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