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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eab03498c081d507c6920aa3d4a84c9cd464179d732072745edc2998e9bf3281' 
  AND token = 'HnrLbgCEr8mkwMxcgp+7ssZU7Z3qn6cCpE91icXBQ6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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