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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '518feb58d36471665e1a442b2bfc11d6af27eff2f2240055f26f5db0c36c2fb5' 
  AND token = 't+H4JU5o+W3FmkQ5g+bFX/3zh9KvOegH3ziME7QuTAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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