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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e8fa47c1071f06fe26e6be832e4756ae4cdb23e28daef7da67117f396f5e3f7' 
  AND token = 'i2o75rmtXI0L6U2xxZ7g9YEH7nW6R064G4kyaw9h+u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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