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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c312f6727cad6e44cea318eed8b17b0861d103cc24b18c49c2f8e3d7f139a13' 
  AND token = 'kElD1y/UVagCe3T9B0xIvwO9kHiSX/+K9VgzPfoM7b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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