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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6e08511ed0089232413b4ea9394869670a6dd1e1acc8ef0d232035c05af4373' 
  AND token = 'r1H2YODNH4u2JVn9DL6ZRLnYORmb2T0SWf1Um77f/Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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