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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '358aac2d5ad5517366c287bb471df6c0b2f50e5f2aeca0fb2e0277aac48c2bc2' 
  AND token = 'QpI/D5+rMjXn8BEx3s1qZUXb6CXozLVE0NX0Ngb3ooQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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