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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53ee13c1d7b17b84bb9598f3be35fc1f147f20ec555eae1909587fbc055f864b' 
  AND token = 'bop1giAOE3J8Qa9uKqnLTvOcQzAW3ODqendOngfG7dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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