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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '703445bce7022ba0c7bdfed5c8463a585891a59101ca985a5beeb0929bc2d2b0' 
  AND token = 'nHAcDDvSxaaU3zjD9+rd4A9K+6G6uh9mCaUr/7f6Ruc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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