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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4fd6cd792fd540dc00a2ef3fb4d85f7004fda90494452c5497eca62a0a0d54a' 
  AND token = 'W+0BRJD1+qli+S+rlN2EufSsNt17suz6Gsb96+t3no8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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