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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87cfd1fc863fe8c02cb48dda0dc9c4932e1eb5a74a8a60d01be49ee0c3308ae8' 
  AND token = 'tPbBI5zdNV/2WriSARX3R+JnOJ0Vo0K+4NoSdNLtXNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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