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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb2872f96b7f8c8551b505a9af34f5262f17cdbde0ce23dc8d7c10d3e702ac92' 
  AND token = '8+l5FZc0WGGfF0kdTiBOykBbFk+NTjXhIS0rrOkmPYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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