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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0da21a02f42dcc41a71af6e978e20bd3eee1e9520f8528adea1c6b84c101bbc' 
  AND token = '8E+nMh0loOiUVsg5WK/KfKHaLety4YnBF2LyNLQbKJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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