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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '704bc66e619a133b8f25e6514f8cbc462ca882f325ce555b0a81fd0cd69ed9a5' 
  AND token = 'b7ak5S4hp4prBzDXKTjt+oQ7IZ7fQPeG3Vt9RBBX+54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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