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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0494d38818cd1e6ebc639a0b1a5cbc6c59de74d11ec81cc8845d4513a1e6b434' 
  AND token = '+E8eCVYR0bm2dOwc1JIUkSw2aIQ++/i4qaAwD0QVFdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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