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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38673a82f068381cee8f901e15a449d7d3f75352c18a94ada8f7ba8fb4361d82' 
  AND token = 'id4ucr0QAp3YXOnCxjGf7CEmoH39nL8dtBu4r0ZmI+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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