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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a71e25bd04d3ae2934f56eaa7cf6c00a54027f065a5f9dc2ce3dd2b000ead0e' 
  AND token = 'wrdgff3s+KnnyC19FIGzGhaaeiB1sgfOstGqVtG0ohM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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