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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e64870f081664e7efe693fda7fca2eb614ee4ce0547cf8ed57748d61e74318f' 
  AND token = 'mBFxOAv1mQVFnatM0129EgvzPXDcyG0c997iy1ck05g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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