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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0bc1d10a301578659c47d64e0650caa8f6dd75a8ae05779f58a5c496a4ab883' 
  AND token = 'it7GJCi1VjWP3DjbDV6xcoI/l5QzV+Jn4DS7GqpheUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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