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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ede786f5c58327b18d76dfa9d211b62fd99682652a44bc4c123c983c7c79b794' 
  AND token = 'mjGHeijf6lCm3a7L9fvyx1npeWb3C2C+iJQcpFXyVUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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